Two-wire dimmer with improved zero-cross detection
First Claim
1. A lighting control device comprising:
- a controllably conductive device configured to supply an AC line voltage to a load in response to a control signal, wherein the controllably conductive device is non-conductive for a first duration of time and is conductive for a second duration of time, wherein the first duration of time and the second duration of time are within the same half-cycle of the AC line voltage;
a signal generation circuit configured to generate a fill signal;
a combiner circuit for combining a signal from the controllably conductive device during the first duration of time and the fill signal during the second duration of time; and
a filter circuit configured to receive the combined signal from the combiner circuit, wherein the signal generation circuit is configured to shape the fill signal such that delay associated with filtering the signal from the controllably conductive device during the first duration of time and the fill signal during the second duration of time is consistent with delay associated with filtering the AC line voltage.
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Accused Products
Abstract
A two-wire lighting control device, may include a controllably conductive device, a signal generation circuit, and a filter circuit. The controllably conductive device may apply an AC line voltage to a load, being conductive for a first duration of time and non-conductive for a second duration of time within a half-cycle of the AC line voltage. The signal generation circuit may generate a non-zero-magnitude signal. And, the filter circuit may receive a signal from the controllably conductive device during the first duration of time and the non-zero-magnitude signal from the signal generation circuit during the second duration of time. The non-zero-magnitude signal may, in effect, fill-in or complement the signal from the controllably conductive device, and any delay variation as a function of the firing angle of the controllably conductive device through the filter circuit may be mitigated by the presence of the non-zero-magnitude signal.
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Citations
39 Claims
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1. A lighting control device comprising:
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a controllably conductive device configured to supply an AC line voltage to a load in response to a control signal, wherein the controllably conductive device is non-conductive for a first duration of time and is conductive for a second duration of time, wherein the first duration of time and the second duration of time are within the same half-cycle of the AC line voltage; a signal generation circuit configured to generate a fill signal; a combiner circuit for combining a signal from the controllably conductive device during the first duration of time and the fill signal during the second duration of time; and a filter circuit configured to receive the combined signal from the combiner circuit, wherein the signal generation circuit is configured to shape the fill signal such that delay associated with filtering the signal from the controllably conductive device during the first duration of time and the fill signal during the second duration of time is consistent with delay associated with filtering the AC line voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A lighting control device comprising:
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a controllably conductive device for controllably supplying an AC line voltage to a load in response to a control signal, wherein the controllably conductive device is non-conductive for a first duration of time and is conductive for a second duration of time, wherein the first duration of time and the second duration of time are within the same half cycle of the AC line voltage; a signal generation circuit configured to generate a fill signal; a switch configured to switch between a signal from the controllably conductive device and the fill signal based on the control signal, the switch configured to select the signal from the controllably conductive device during the first duration of time and the fill signal during the second duration of time; and a filter circuit that receives an output of the switch; wherein the signal generation circuit is configured to shape the fill signal such that delay associated with filtering the signal from the controllably conductive device during the first duration of time and the fill signal during the second duration of time is consistent with delay associated with filtering the AC line voltage. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A lighting control device comprising:
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a controllably conductive device for supplying an AC line voltage to a load in response to a control signal, wherein the controllably conductive device is non-conductive for a first duration of time and is conductive for a second duration of time, wherein the first duration of time and the second duration of time are within the same half-cycle of the AC line voltage; a signal generation circuit that generates a non-zero-magnitude signal; and a filter circuit that receives a signal from the controllably conductive device during the first duration of time and the non-zero-magnitude signal during the second duration of time, the signal from the controllably conductive device representing a voltage developed across the controllably conductive device, and the non-zero-magnitude signal during the second duration of time being sine-wave-shaped to complement the voltage developed across the controllably conductive device. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification